Highly Efficient Ligands for Dihydrofolate Reductase from <i>Cryptosporidium </i><i>hominis</i> and <i>Toxoplasma </i><i>gondii</i> Inspired by Structural Analysis
作者:Phillip M. Pelphrey、Veljko M. Popov、Tammy M. Joska、Jennifer M. Beierlein、Erin S. D. Bolstad、Yale A. Fillingham、Dennis L. Wright、Amy C. Anderson
DOI:10.1021/jm061027h
日期:2007.3.1
The search for effective therapeutics for cryptosporidiosis and toxoplasmosis has led to the discovery of novel inhibitors of dihydrofolate reductase (DHFR) that possess high ligand efficiency: compounds with high potency and low molecular weight. Detailed analysis of the crystal structure of dihydrofolate reductase-thymidylate synthase from Cryptosporidium hominis and a homology model of DHFR from Toxoplasma gondii inspired the synthesis of a new series of compounds with a propargyl-based linker between a substituted 2,4-diaminopyrimidine and a trimethoxyphenyl ring. An enantiomerically pure compound in this series exhibits IC50 values of 38 and 1 nM against C. hominis and T. gondii DHFR, respectively. Improvements of 368-fold or 5714-fold (C. hominis and T. gondii) relative to trimethoprim were generated by synthesizing just 14 new analogues and by adding only a total of 52 Da to the mass of the parent compound, creating an efficient ligand as an excellent candidate for further study.